دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Analysis of heavy rainfall led to flood risk on 27 February 2010 in eyvangharb city (in west of iran)
1
16
FA
ghavidel@modares.ac.ir
Y
dhatami68@yahoo.com
N
In this study try to synoptic Analysis heavy rainfall 66.8 mm led to flood on 27 Feb. 2010 in eyvangharb region situated in west of Iran. First by data from terrestrial station heavy rainfall was recognized. Then by data from upper atmosphere and draw related maps, heavy rainfall of eyvangharb was evaluated. drawn and analysis of maps shown that intense pressure gradient between low pressure seat in west, Northwest and central of Iran with high pressure of north of Caspian sea from north, high pressure seat on west of china from east, and also high pressure from northeast of Africa from west, and west south lodgment deep of trough on Iraq, Saudi and east of Mediterranean sea on all level and Iran lodgment in east of trough and under the region of upper divergence and also upward air in the all of level that caused climb and instability. Negative values of eddy that shown existence of it for all atmosphere levels. In addition high thickness of air at heavy rainfall time and also positive vorticity values at all levels indicate divergence flow and ascending air for all levels of air is the agents for occurrence heavy rainfall. seat of polar front jet stream on west of country and merge it with jet stream seats on European and Mediterranean sea from west and jet stream seats on west china from east, caused heightened instability and produce baroclinic conditions for eyvangharb. finally main resource of humidity of rainfall in eyvangharb at(500, 600 and 700 hectopascal)are from Mediterranean sea and red sea, but at levels near the earth surface (850, 925 and 1000 hectopascal), Caspian sea plays a main role in provide of humidity in heavy rainfall. The maps showed merge and convergence of humidity on west and northwest of Iran that one of main reason for heavy rainfall occurrence.
Synoptic analysis, heavy rainfall, flood, Ayvanghrb
http://geographical-space.iau-ahar.ac.ir/article-1-122-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-122-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
An analysis on spatial heterogeneous in urban areas with emphasis on the rule of the poor and low level tissues and settlements (case study: the city of Mahabad)
17
43
FA
mostafa
mirabadi
Islamic Azad University, Science and research Branch, Tehran, iran
mirabadi1985@gmail.com
Y
azita
rajabi
Islamic Azad University, Central Tehran Branch, Tehran, Iran
Azitarajabi@yahoo.com
N
Masoud
mahdavi hajilooie
Islamic Azad University, Science and research Branch, Tehran, Iran
Mahdavihaj@yahoo.com
N
Inequality and social justice long has been considered by social and humanity sciences and various schools of thought in societies. That is, spatial inequality as one of the important examples of social inequality is unavoidable in allocation of resources and facilities in urban communities. Therefore, what is to be paid attention by urban planners is measurement and affective factors on spatial inequality in order to prevent or to lead to a decrease in rifts between neighborhoods and urban areas. Based on this, present research is done with the descriptive-analytical methodology and with the aim of measuring and analyzing the spatial inequality between the areas of the city of Mahabad with emphasis on the rule of poor tissues and settlements in creating an urban spatial heterogeneous structure. In this paper by using the demographic, social, economic and skeletal indicators, the TOPSIS and the cluster analysis models, different areas of the city of Mahabad are rated and leveled in the year of 1393. Results and conclusions clearly show the unfavorable development of the city of Mahabad. But this unfavorable development doesn't only link to poor and old tissues and settlements of the city. Also, it has been found that not only resources and services are not distributed based on population but vice versa is right. Considering the deep gap between urban areas in skeletal indicator, it can be inferred that the issuing and prioritized problem in the unbalanced spatial structure of the city of the Mahabad is the skeletal factor in which the urban services and facilities is in the top which this has roots in the weakness of performing and exercuting the urban projects.
Spatial Inequality, TOPSIS Model, Cluster Analysis Model, Poor Settlement, Mahabad
http://geographical-space.iau-ahar.ac.ir/article-1-2229-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-2229-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Analysis of Social Consequences of Changing Rural Area to City Case Study: Niasar City, Sefid Shahr , Barzak and Meshkat in Kashan
45
64
FA
mohsen
shaterian
university kashan
shaterian@kashanu.ac.ir
Y
gity_salahi@yahoo.com
N
ganjimahmood@gmail.com
N
amir.oshnooi@gmail.com
N
That is why changing rural areas to city has become one of the most significant challenges in the late decades, especially in developing countries. This study is based on an applied-basic research. Applied, because in this research, it is being tried to evaluate the theories in one region and on the other hand, it is basic because the research results can be effective in changing rural areas to city. The case study has been chosen according to the purpose of getting familiar and analytic the consequences of this change. Therefore, the impact of changing rural areas to city can be seen and analyzed in their advancement. Going through this research, documental and analytic methods can be used. To analyze the indicators it is needed to collect in formations which the sample volume (700) has been chosen according to the city population with the use of Cochran method. The number of the samples is divided equally in to four rural areas which were changed to city and distributed in Kashan randomly and finally. The data's have been analyzed by SPSS software. results have shown although having city role has got negative aspects such as increasing life, land expenses but the positive ones are more for instance increasing of quality and quantity services , decreasing immigration, increasing of accepting immigrants, development in employment, rise of leisure activities like internet and computer games, exercising, reading books ,magazines ,newspaper ,artistic activities ,travelling , listening to music, increasing people participation in political social affairs. Thus, changing rural areas to cities in Kashan has got a positive process.
Changing Rural Area to City, Kashan, Area, Rural - urban, small towns
http://geographical-space.iau-ahar.ac.ir/article-1-466-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-466-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
determine the best algorithm for land use and land cover extraction and changes detecting from Landsat satellite images(Case Study: Sufi chay Basin of Maragheh)
65
85
FA
Mohamad Hosein
Rezaei Moghadam
scince and reserches
rezmogh@yahoo.com
Y
Soghra
Andaryani
scince and reserches
s.andaryani@gmail.com
N
khalil
Valizadeh Kamran
scince and reserches
valizadeh@tabrizu.ac.ir
N
Farhad
Almaspor
az water
farhadalmaspor@gmail.com
N
Using remote sensing data due to providing updated information, cover repetitive, low-cost assessment of natural resources have a special place. Also change detection in the management and evaluation of natural resources is one of the basic needs. Thus the value of change of land use /land cover (LULC) is the result of the change detection process can obtain on multi-temporal remote sensing images. Therefore, in this study, both of the Landsat satellite images 8 (OLI&TIRS) the year 2013 and 7(ETM+) the year 2000 were used as input data for land cover/ use mapping level 1 and 2. In the meantime, because of the new images OLI, radiometric corrections was formulation with existing equation with using in Erdas software model maker.also from Normalize Difference Vegetation Index (NDVI), Bare Soil Index (BI) and three main components from Principal Component Analyze (PCA) as input alongside other bands were used to increase the accuracy of classification. The polynomial 5 degree from SVM method compared with artificial neural network (ANN) and maximum likelihood classification (MLC). Results showed that support vector machine method using Polynomial kernel and degree 5 (accuracy 92%) gives overall accuracy higher than artificial neural network method (accuracy 89% ) and maximum likelihood method (accuracy 91.8%) . Also SVM method shows better performance where classes exhibit similar spectral behavior. Post classification method used for detect changes in the timeframe of 13 years. The results show large changes in (LULC) was occurred thus need monitoring and proper management is needed for this watershed.
Land use /Land cover, post classification, Support Vector Machine, Artificial Neural Network, Maximum Likelihood Classification, Sufi chay basin
http://geographical-space.iau-ahar.ac.ir/article-1-802-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-802-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
evaluation of the life quality indicators in small towns organbs (case study:city of dena)
87
109
FA
azam
khanaghaei
university of isfahan
a.khanaghaei999@gmail.com
Y
aliakbar
razmpoori
university of isfahan
ali.razmpoor@yahoo.com
N
Having a good life quality, always has been the human wish. In recent years the life quality in urban environments significantly has been conducted by scholars of urban science and research. In a general definition the life quality is a conception word showing how it can remove some needs and understanding criteria for receiving the satisfactionor dissatisfaction and groups from the life demisions. The main goal of this study is to assess the quality of urban life using subjective measures of vision are inhabitants Dena. Given the sample size, population 384, is obtained by using the Cochran formula. To check the reliability of the study's pre-test and Cronbach's alpha coefficient was used that Cronbach's alpha for the total scale indices were calculated as 0.791, which is indicates good reliability and acceptable questionnaire. The results show that Measures of economic health, mental health, environmental health, physical health, social health, and transportation, with the 0.524, 0.360, 0.225, 0.213, 0.203 and 0.116 have greatest impact the elevation of the life quality in Dena city
quality of life, Subjective indicators, path analysis, City of Dena
http://geographical-space.iau-ahar.ac.ir/article-1-1121-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1121-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Investigation of human role on morphological channel changes of Lighvan Chai River
111
135
FA
S_khaleghi@sbu.ac.ir
Y
roostaei@tabrizu.ac.ir
N
khorshid@tabrizu.ac.ir
N
rezmogh@yahoo.com
N
maghorbani@tabrizu.ac.ir
N
Human role alter the amount of water and sediment inputs to rivers, directly and indirectly and leading to changes in channel geometry, such as changing the width and depth of the river. In this study was investigated channel morphology changes of Lighvan river by using surveys and field studies of Lighvan River, HEC-RAS model and changing river morphology of Lighvan and the human role in it were studied. Results show that there are not any systematic trends between morphological parameters and distance from downstream of river so that width, depth, width/depth ratio, bankfull area and discharge have not increased systematically towards downstream that shows beside of natural factors, unnatural factors such as human interventions were important in channel morphology changes. Changes of width and depth of the river in different cross- sections varies so that the number of changes in the channel width is visible by channelization (eg in sections 2, 6, 8 and 12) also changes of channel width and depth in other cross-sections such as cross-sections 4 and 5 is due to increasing agriculture lands and housing in river front. Also channel morphological changes during the past decade indicate that the dominant process in the studied reach was incision and narrowing of the channel. Only in some sections, aggradation occurred in upstream and in other sections, incision is the dominant process. In general, incision (over 1 m) and narrowing (over 18 meters) are dominate in Lighvan Chai river, though the channel has been widening at some sections such as 9 and 10 and little aggradation in sections 1, 2, 3, 5 and 7. All these changes indicate that, along with the natural factors (increasing the maximum discharge), the role of human factors (channelization and riverfront land use changes) has a significant impact in the Lighvan river channel changes.
channel morphology, cross-section, human intervention, Lighvan Chai River
http://geographical-space.iau-ahar.ac.ir/article-1-944-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-944-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Correlation between Earthquake Occurrence, Day times and Rainfalls in Iran
137
153
FA
ir_jabbari@yahoo.com
Y
Z_Ghaderi20@yahoo.com
N
In this research has been tried to do a statistically study in Iran and geomorphic zones to open a statistically discussion about time of earthquakes and their probably correlation to amount of rainfalls at some days before earthquakes.Earthquakes including 4 Richter and above records was obtained from site of IIEES (International Institute of Earthquake Engineering and seismology ) and the rainfall records occurring 10, 15, 20, 30 and 40 days before the earthquakes occurrence (DFEO). All of data and then data relation to each geomorphic states sort on excel spreadsheet and analyzed at 19 version of SPSS software using to different tests. X2 test and phi test show that there isn't any significant difference between occurrence of earthquakes frequency at day times and nights during 30 years. Spearman correlation coefficient didn’t show a significant relationship between amount of rainfalls during 4 periods (10, 15, 20, 30, and 40 DFEO) and earthquakes. X2 test and Cramer's V test also showed a poor association between rainfalls and earthquakes numbers. However, more study on data elucidate that it can find a significant correlation at some years. Results showed there is a relation between frequencies of occurrence rainfalls for 10 DFEO and frequencies of earthquakes at the Zagros state. Nonetheless, it wasn't observed any relation when the rainfalls under 10 mm unaccounted in analysis. So, this clears that more earthquakes at the Zagros state occurred at lack or less rainfall situation. But, a more study on data during the time periods showed a significant relation for 10 and 15 DFEO in 1996 on which occurrence of earthquakes has increased along with increasing of precipitation to 38 mm limit namely, among of 52 earthquakes, 14 cases of earthquakes have included more than 10 mm and less than 38 mm rainfall, whiles, it has occurred 28 cases of earthquake when rainfalls have passed from 38 mm limit.
fault, Earthquakes, rainfall, day times, Iran.
http://geographical-space.iau-ahar.ac.ir/article-1-1034-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1034-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Accuracy assessment of multiple linear regression, (ARIMA), and (GRNN) models to prediction of particulate matter PM2.5 concentration
155
176
FA
Shadi
Ausati
University of Kurdistan
shadiaosati@gmail.com
N
Jamil
Amanollahi
University of Kurdistan
j.amanollahi@uok.ac.ir
Y
Bakhtiyar
Mohammadi
University of Kurdistan
b.mohammadi@uok.ac.ir
N
Existence of environmental crises and problems in the world has led the increasing of importance of the discussion about the environment and environmental issues in the past half century. In the recent decades, the air pollution as one of the environmental crises has been known as a most harmful natural disasters. Due to harmful effects of particulate matter on human health, prediction of particulate matter concentration in the coming days could be reduce these effects. Therefore, in this study the accuracy of linear models including multiple linear regression (MLR), autoregressive integrated moving average (ARIMA), and nonlinear model of General Regression Neural Network (GRNN) to prediction of particulate matter PM2.5 in Sanandaj city were tested to choose the most accurate prediction. To date, no study has been conducted to investigate the accuracy of the GRNN model to prediction of atmospheric pollution in Iran. Air quality data consisting of O3, CO, NO2, SO2, PM10, and meteorological data such as average minimum temperature (MinT), average maximum temperature (MaxT), average atmospheric pressure (AP), daily total precipitation (PR), daily relative humidity of the air (RH) and daily wind speed (WS) of 2015 as independent variable and the PM2.5 concentration as a dependent variable were considered. The results showed that the GRNN model with a R2 = 0.81, RMSE = 6.9468 and MAE = 5 in the training phase and the amount of R2 = 0.74, RMSE = 5.0725 and MAE = 3.4874 in the test phase had been best performance to predict of particulate matter PM2.5 compared to linear models in Sanandaj city.
Particulate matter (PM2.5), prediction, Sanandaj, linear regression, autoregressive integrated moving average, and General Regression Neural Network.
http://geographical-space.iau-ahar.ac.ir/article-1-2093-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-2093-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
The effect of the modernist approach to Islamic urbanism (Case Study: Ahar)
177
195
FA
shafizade.a@gmail.com
Y
The purpose of this paper is to examine the impact of urban spatial evolution of the modern attitude that has to do with a case study Ahar. based on the structure of Iranian cities including the cultural heritage of this land are severely threatened today because modern attitudes have been found and destroyed.The overall research model cities during the two periods, Islamic and modern outlook and match it with Ahar, research methods, descriptive, analytical and comparative degree and the quality is done, the result was that the effect of exogenous influences on the development of vision-based Muslim Ahar, the configuration of the constituent elements of the original and of course, the market as the backbone of the city's mosque, Ark state and localities in which the organic link interconnect structure have been in continuous, systematic and coherent structure and changing the layout of your lost cities of the "market" in Islamic thought "Street" in modern thought, has caused the town through the body, causing a rupture, a major transformation and cause tissue to be worn.
Islamic city, a modern approach, the traditional context of Ahar, architectural elements
http://geographical-space.iau-ahar.ac.ir/article-1-1023-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1023-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
the application of geomorphometry in quantitaive relationships plio quaternary alluvial fans( case study : south Binalood forehead using RS and control rate)
197
215
FA
aboalfazle
behniafar
Islamic azad university mashhad branc
a.behniyafar@yahoo.com
Y
hadi
qanbarzadeh
Islamic azad university mashhad branc
hadi.qanbarzaheh@yahoo.com
N
jafar
rokni
Ferdowsi University of Mashhad
ja_ro823@stu.um.ac.ir
N
mohsen
rezaei arefi
Islamic azad university mashhad branc
rezaei.arefi61@yahoo.com
N
The use of SPOT and Landsat satellite images as combination with field test presents a very useful information on the identification of alluvial fans and their geometry. Existence of very typical alluvial fans belongs to the Plio-Quaternary on the Binalud mountain brow is a very interesting environmental laboratory in which these relationships can be studied and analyzed. This study is done by experimental and laboratory method based on fielddata analysis and interpretation of satellite images. So that identification of fans were done through SPOT and Landsat satellite images along with control of the 1/4000 aerial images of Binalud blocks. For clarification of alluvial fans boundary, ground control operations was carried out in order to their Geomorphometry results have less error. The main purpose of this research is to identify the geomorphometryan quantitative relationships of south Binalud's alluvial fans through reconciliation of round prospectand field observations. Comparison of SPOT and Landsat satellite images in identification of 20 large and small alluvial fans of southern Binaloud mountains forehead revealed that SPOT resolution strength and accuracy of images in geometric reviewing of alluvial fans is higher than Landsat but Landsat satellite images is more applicable in identification of large-scale forms of alluvial fans surfaces.
geomorphometry , plio quaternary alluvial fans, alluvial fans quantative relationships and drainage basin , SPOT imagery ,south Binalood
http://geographical-space.iau-ahar.ac.ir/article-1-1373-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1373-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Landslide hazard zonation in Binalud mountains by Bayesian method (Torghabeh- Darrod new Transit road)
217
238
FA
malihe
mohamadnia
Hakim Sabzevari University
malihe.mohamadnia@yahoo.com
Y
Abolghasem
Amirahmadi
Hakim Sabzevari University
amirahmadi1388@gmail.com
N
elahe
akbari
Hakim Sabzevari University
e.akbari@yahoo.com
N
shaharm
bahrami
Hakim Sabzevari University
sh.bahrami@gmail.com
N
Landslide is one of the destructive erosion events in slopes that causes financial losses on the roads. Identification of factors affecting landslide occurrence and hazard zonation mapping is considered as one of the basic tools to manage and reduce possible damage. In this research, we tried to zonate the landslide hazard at proposed Torghabeh- Darrod road by using Bayesian method, so that we can prevent many human and financial risks. Therefore, by collecting the required information on the landslides distribution in the area, the maps of landslide distribution, along with13 data layers including: slope gradient, aspect, curvature, elevation, landuse, geology, distance from road, distance from drainage, distance from fault, soil and rainfall zones was produced in the GIS environment. By using Bayesian probability theory, the relationships between each factors and landslide points were determined and subsequently the classes weights of each factors were obtained. Finally, landslide hazard zonation maps was prepared by Bayesian theory for the study area, in such a way that all effective factors were used and each factor was deleted. Finally the accuracy and precision of the maps were calculated using the ROC carve and 30% of landslide points. Data show that the precision of prepared probabilistic model by the Eleventh approach modeling (the distance from the fault was removed) was determined about 86.5% (very good) in study area. Using the provided map, we can identify unstable areas, and rely on them in the implementation of development planning particularly road construction.
: Landslide hazard zonation, Bayesian theory, curve ROC, GIS, Torghabeh- Darrod new Transit road.
http://geographical-space.iau-ahar.ac.ir/article-1-1068-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1068-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Spatio-Temporal Analysis of Water Vapor Pressure Trend in South and West south of Ian
239
256
FA
Younes
Khosravi
Shahid Beheshti University
Younes_kh15@yahoo.com
Y
Hasan
Lashkari
Shahid Beheshti University
dr_lashkari61@yahoo.com
N
Ali Akbar
Matkan
Shahid Beheshti University
a-matkan@sbu.ac.ir
N
Hosein
Asakereh
Zanajn University
asakereh1@yahoo.com
N
In this paper, one of the most important climatic elements, water vapor pressure, has been analyzed. In this contest Mann-Kendall and Sen's Slope Estimator techniques are used to analyze the water vapor pressure trend and it's change's slope in the South and South West of Iran. Accordingly, 12 stations along the 44-year period (1967 to 2010) for stations analysis and 47 stations along the 16-year period for spatial survey were tested. To calculation Mann-Kendall and Sen's Slope Estimator tests on the whole study area, it was divided into the optimal spatial resolution, cells by 9 × 9 km resolution (3,338 cells), and then the monthly, seasonal and annual WVP time series were extracted by MATLAB software. After preparation of the matrix by size 30 × 3338, Mann-Kendall and Sen's slope estimator tests were done on all cells and after evaluating different geostatistical methods such as IDW, Kriging and RBF, the most efficient method, kriging, was chosen to derivation of maps.The results indicated that the upward trend of water vapor pressure was in the coastal areas of the Persian Gulf and especially the Boushehr province. On the other hand, the significant downward trend was observed based on the heights, especially the Zagros highlands.
Trend, Changes, Mann-Kendal, Sen's Slope Estimator, Water Vapor Pressure, South and South West of Iran
http://geographical-space.iau-ahar.ac.ir/article-1-1268-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1268-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Susceptibility of Mass movement in Zangmar Basin (Maku City)
257
272
FA
m-Ghahroudi@sbu.ac.ir
Y
ayla_gholizadeh@yahoo.com
N
Mass movements is a processes which caused Geomorphological evolution at steep and rocky slopes, and due to the sudden at the time of occurrence, the valleys and the road are blocked, also the mountainous regions are destroyed. Zangmar River Basin is located in Maku province and included some urban areas such as Maku city and they have susceptible areas to mass movements like landslides, collapse, debris flows and mud flows. An aim of this study is to identify susceptible areas to mass movements. The data were used include topographic 1:25000, geological maps1:100,000, climatic data and field observations. The method are included the sampling and definition of the variables affecting the occurrence of mass movements are based on the samples. Fuzzy model was used to determine value membership degree and then they were transformed to the normal distribution based on fuzzy Gaussian membership function. The results showed that occurrence of mass movements were increased with increasing slope and height and Mass movements have a direct relationship with the inverse distance from the fault, Geomorphic unit and integrated, hard rocks of ruggedness.
Mass Movment, Maku city, Fuzzy Model, Zangmar basin
http://geographical-space.iau-ahar.ac.ir/article-1-973-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-973-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Synoptic Analysis and Path Simulation of Severe Dust Storms
273
291
FA
Mehry
Akbary
mehryakbary@khu.ac.it
Y
melody.farahbakhsh@yahoo.com
N
According to the definition of W.M.O., dust storms are storms which reduce the view visibility to lower than 1 Kilometer. So in this survey the synoptic conditions associated with the occurrence of dust storms in southwest of Iran, are analyzed. To investigate the factors influencing the occurrence of dust storms, 500 cases of dust phenomena (code:06) were selected and analyzed using 4 synoptic stations data (Ahwaz, Khoramabad, Ilam & Lorestan) for the spring and summer seasons in a period of 13 years (2000-2012). For statistical analysis of these phenomena, in the first step, dusty days were categorized in 3 catergories according to their view visibility: less than 2 Km, 2-4 Km and more than 4 Km. Then distribution frequency analysis tests using SMADA software were run for cases with view visibility of less than or equal to 1 Km and finally cases with view visibility of 500 meters which were also comprehensive and recorded in all selected stations were extracted. In next step, 3 dust storms which had been selected were analyzed. After receiving the NCEP/NCAR reanalysis data, using GRADS software, maps of geopotential heights, wind speed and vorticity advection were produced and analyzed. In order to identify the source of dust generation, tracing and simulating the path of dust particles, HYSPLIT model Lagrangian approach of backward trajectory was used. According to the findings of the synoptic analysis, in all 3 severe dust storms, existence of low pressure cells in the central regions of Iran, led to the convergence and air intake at near-ground levels and divergence at higher levels and negative vorticity in southern regions of Iraq and relatively strong positive vorticity in the Iran's central areas, resulting in cyclonic movements (dust catcher movements) in the southwestern regions of Iran. These conditions resulted in the transfer of dust from the dry desert areas of Iraq and high speed winds in the lower levels of dust particles in the region accelerated the transfer rate. Based on the HYSPLIT model outputs, major sources of dust generation included arid zones of Southern Turkey, Iraq and Syria deserts which entered the under studied areas from west and northwest directions.
Severe Dust Storm- Path Simulation– Synoptic- Southwest of Iran
http://geographical-space.iau-ahar.ac.ir/article-1-1803-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1803-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
: potential flooding, ANP, fuzzy logic, zoning, Lighvan river
293
312
FA
Mousa
Abedini
University of Mohaghegh Ardabili
Abedini@uma.ac.ir
Y
Ebrahim
beheshti javid
University of Mohaghegh Ardabili
eb.beheshti@yahoo.com
N
Today, environmental hazards and deal with them is one of the most important concerns for researchers in the field of environmental planning and management of the crisis. In crisis management, flood risk is one of the riskiest natural disasters that have to special look to it. One of the most important tasks in the field of flood mitigation and prevention of occurrence is zoning of potential flooding and classification of the flood risk. In this study Lighvan River Basin has been studied in terms of potential flooding by using ANP and fuzzy logic models and using of natural and human parameters (Land slope, aspect, plan and profile curvature, land use, precipitation, material of land, soil, vegetation density and drainage density). According to results of the research the southern part of Basin (classes with great and high potential) have been introduced as areas prone to flooding that are included respectively 11 and 23.6 percent of the area. More areas with low and very low potential are in areas that are characteristic of often with agriculture and gardens, formations with high permeability and slow slope and low altitude and are included respectively 22.7 and 12.3 percent of the area. These areas mostly are concentrated in the lowlands and slow slope and lower part of the basin where the due to the slow slope and deep sediments and permeable materials have high the posibility of influence precipitation and runoff in this area is very low respective to the other sectors.
potential flooding, ANP, fuzzy logic, zoning, Lighvan river
http://geographical-space.iau-ahar.ac.ir/article-1-1682-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-1682-en.pdf
دانشگاه آزاد اسلامی واحد اهر
Geographic Space
1735322X
16
55
2016
12
1
Choosing the Optimized Srtategy of Sustainable Livlihood Faced with Drought by Using Integrated Model SWOT and TOPSIS Case study: Rural areas of central district of Hashtrood
313
339
FA
saleh
asghari saraskanrud
asghari56@gmail.com
Y
hamid
jalalian
hamidjalalian@khu.ac.ir
N
farhad
azizpur
azizpour@khu.ac.ir
N
sayyad
asghari saraskanrud
sayyad.sasghari21@gmail.com
N
There is an agreement among most of writers and major internatonal development organizations that for developing of local societies the past and present approaches have no success for necessity of Poverty Reduction. And change in approach is necessary. Including efforts for Implementation of sustainability, the focuse is on livelihood. and the advantage of this approach is that people can be proposed. thinking and concentration on livelihood as a means for undrestanding the quality of life and welfare are new approaches of choosing optimized developing strategy among developing societies.In a way that prepares recourses that people can optimize their life with it and enjoy. The main purpose of this research is strategic analysis of sustanaible livelihood faced with ten years term of dominant drought in rural areas. There for this study from the perspective of practical goal and in term of nature is descriptive-analytical. Which pays to checking quintent property of rural residents of central district of Hashtroud county in order to choosing suitable strategy of sustainable livelihood approach. The method of this Study is based on attributive-Questioning. and Delphi analysis tools for choosing items and SWOT technique is for choosing suitable strategy. For this purpose 13 strength points,16 Weakness points,15 treath, 14 opportunity and 18 strategy are represented. For ranking, strength points ,weakness points, threats and opportunities that are assesed by experts, also TOPSIS teqnique are used. According to findings, offensive stategy is diagnosed the best strategy for achieving the sustainable livelihood of case study villages. Also according to TOPSIS technique findings the opportunities in first rank and strength points in the second have the most effects on stability of residents lives. For achieving the sustanable livelihood the offensive strategies should be put in Priority.
Optimized Srtategy, Sustainable Livlihood, Drought, SWOT and TOPSIS Technique, Hashtrood county
http://geographical-space.iau-ahar.ac.ir/article-1-2219-en.html
http://geographical-space.iau-ahar.ac.ir/article-1-2219-en.pdf